Authorities on Saturday searched Seagoville storage unit as they focused their investigation into the slayings of the Kaufman County district attorney, his wife and a top prosecutor on a former justice of the peace.

Eric Lyle Williams is now the prime suspect in the murder of District Attorney Mike McLelland, his wife, Cynthia, and Assistant District Attorney Mark Hasse, law enforcement authorities say.

“We can sleep a lot better tonight,” said one law enforcement official.

Williams, 46, has not been charged in connection with the slayings. He was arrested early Saturday on a terroristic-threat charge after dozens of law-enforcement workers executed a search warrant at his Kaufman home on Friday.

Authorities said anonymous threats recently were emailed to county employees and they were traced back to Williams.

His attorney, David Sergi, said Friday that Williams “vigorously asserts his innocence and denies any involvement” in the killings. He could not be reached for comment Saturday but has said Williams is innocent.

The McLellands were found dead in their home over Easter weekend. Hasse was gunned down Jan. 31 as he walked to the county courthouse.

Williams was convicted of stealing county equipment last year and sentenced to probation in a case prosecuted by McLelland and Hasse. That case is on appeal. Williams faces another theft charge in a case related to money allegedly misused from a law library fund.

Williams’ bail on that pending theft case has been revoked. He is being held on bail totaling $3 million..

Kim Williams, his wife of 15 years, told The Dallas Morning News on Saturday, “I’m really tired. I was up almost all night. I’m not ready to talk.”

The assassinations of Hasse and McLelland in Kaufman, 30 minutes east of Dallas, spurred increased security for officials across North Texas and sparked a massive investigation involving the Kaufman County Sheriff’s Department, the Texas Rangers, the FBI and other agencies. Police initially had no solid evidence against anybody and questioned many people, including members of the Aryan Brotherhood of Texas prison gang.

But suspicion long centered on Williams, authorities say. His first theft case — in which he was accused of stealing three computer monitors — was aggressively prosecuted by McLelland and Hasse. At the emergency room in the hours after Hasse’s murder, McLelland told others that he believed Williams was behind his top assistant’s death. He made similar statements to other people before he died.

Williams lost his job, law license and health insurance.

In an interview before his arrest, Williams told The Dallas Morning News that investigators had been coming to his house on a regular basis to question him about the slayings. His attorney has said that Williams submitted to gunpowder residue tests after the slayings. They were negative, his attorney said.

In a brief interview Thursday at his home, Williams told The News that he’d also voluntarily turned over old cellphones for authorities to examine. That same day, a Kaufman deputy and Texas Ranger were seen entering the Williams home, spending a few hours there.

Whatever authorities saw inside the home allowed them to go to a judge and secure search warrants for Williams’ home. Dozens of investigators scoured the home beginning Friday afternoon.

Richard Mohundro, one of Williams’ neighbors, said it was well after midnight when investigators finished. They backed up a truck and hauled out plastic bins of documents and other items.

“They cleaned that house out,” Mohundro said. “They were coming out of the front door and around back, too.”

The home of Williams’ in-laws was also searched.

The search warrant executed at the Williams home is believed to have led to the execution of the search warrants at Gibson Self Storage on Seagoville Road near U.S. Highway 175.

About 25 Texas Rangers and FBI agents converged on the storage unit. Authorities searched the units and a car was found inside.

Authorities also strategically parked vehicles around the units and put up a tarp in an apparent attempt to conceal what they found.

Earlier Saturday, Williams’ neighbor, Mohundro, described him as a nice guy.

“He mows the yard,” he said. “He putters around in the yard a little bit.

“He had a dog that was raising hell and I emailed him. And I said, ‘Judge you got a dog, I hate to complain, but you got a dog that’s just raising hell,’ … and I said it’s noticeable. … He picked up the phone and called me. He said, ‘I’ll take care of it.’ And I don’t know what he did, but I didn’t hear that dog again.”

Mohundro also said the Williamses never had many visitors, and that Williams was known for riding his Segway around.

“In the mornings when he was still at the law office, he would be riding his little Segway to work with his briefcase,” Mohundro said. “On the weekends, he’d be riding his little Segway with fatigues on.”

“Anybody that rides a Segway up and down the street in Kaufman, Texas, is kinda strange, but that doesn’t make you guilty of anything.”